<template>

  <div class="app-container">

    <h2 style="text-align: center;">发布新课程</h2>

    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="最终发布"/>
    </el-steps>

    <el-button type="text" @click="openChapterDialog()">添加章节</el-button>

    <!-- 章节 -->
    <ul class="chanpterList">
      <li
        v-for="chapter in chapterVideoList"
        :key="chapter.id">
        <p>
          {{ chapter.title }}

          <span class="acts">
                    <el-button style="" type="text" @click="openVideo(chapter.id)">添加小节</el-button>
                    <el-button style="" type="text" @click="openEditChatper(chapter.id)">编辑</el-button>
                    <el-button type="text" @click="removeChapter(chapter.id)">删除</el-button>
                </span>
        </p>
        <!-- 视频 -->
        <ul class="chanpterList videoList">
          <li
            v-for="video in chapter.children"
            :key="video.id">
            <p>{{ video.title }}

              <span class="acts">

                    <el-button style="" type="text" @click="openEditVideo(video.id)">编辑</el-button>
                    <el-button type="text" @click="removeVideo(video.id)">删除</el-button>
                </span>
            </p>
          </li>
        </ul>
      </li>
    </ul>
    <div>
      <el-button @click="previous">上一步</el-button>
      <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>
    </div>

    <!-- 添加和修改章节表单 -->
    <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
      <el-form :model="chapter" label-width="120px">
        <el-form-item label="章节标题">
          <el-input v-model="chapter.title"/>
        </el-form-item>
        <el-form-item label="章节排序">
          <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
        <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
      </div>
    </el-dialog>

    <!-- 添加和修改课时表单 -->
    <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
      <el-form :model="video" label-width="120px">
        <el-form-item label="课时标题">
          <el-input v-model="video.title"/>
        </el-form-item>
        <el-form-item label="课时排序">
          <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
        </el-form-item>
        <el-form-item label="是否免费">
          <el-radio-group v-model="video.free">
            <el-radio :label="true">免费</el-radio>
            <el-radio :label="false">默认</el-radio>
          </el-radio-group>
        </el-form-item>

        <el-form-item label="上传视频">
          <el-upload
            :on-success="handleVodUploadSuccess"
            :on-remove="handleVodRemove"
            :before-remove="beforeVodRemove"
            :on-exceed="handleUploadExceed"
            :file-list="fileList"
            :action="BASE_API+'/eduvod/video/uploadAlyiVideo'"
            :limit="1"
            class="upload-demo">
            <el-button size="small" type="primary">上传视频</el-button>
            <el-tooltip placement="right-end">
              <div slot="content">最大支持1G，<br>
                支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
              <i class="el-icon-question"/>
            </el-tooltip>
          </el-upload>
        </el-form-item>

      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
        <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
      </div>
    </el-dialog>

  </div>
</template>
<script>
  import chapter from '@/api/edu/chapter'
  import video from '@/api/edu/video'

  export default {
    data() {
      return {
        saveBtnDisabled:false,
        courseId:'',//课程id
        chapterVideoList:[],
        chapter:{ //封装章节数据
          title: '',
          sort: 0
        },
        video: {
          title: '',
          sort: 0,
          free: 0,
          videoSourceId: '',
          videoOriginalName:'',//视频名称
          id:''
        },
        dialogChapterFormVisible:false,//章节弹框
        dialogVideoFormVisible:false, //小节弹框


        fileList: [],//上传文件列表
        BASE_API: process.env.BASE_API // 接口API地址
      }
    },
    created() {
      //获取路由的id值
      if(this.$route.params && this.$route.params.id) {
        this.courseId = this.$route.params.id
        //根据课程id查询章节和小节
        this.getChapterVideo()
      }
    },
    methods:{
      //上传视频成功调用的方法
      handleVodUploadSuccess(response, file, fileList) {
        //上传视频id赋值
        this.video.videoSourceId = response.data.videoId
        //上传视频名称赋值
        this.video.videoOriginalName = file.name
      },
      handleUploadExceed() {
        this.$message.warning('想要重新上传视频，请先删除已上传的视频')
      },
//==============================小节操作====================================
      //删除小节
      removeVideo(id) {
        this.$confirm('此操作将删除小节, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(() => {  //点击确定，执行then方法
          //调用删除的方法
          video.deleteVideo(id)
            .then(response =>{//删除成功
              //提示信息
              this.$message({
                type: 'success',
                message: '删除小节成功!'
              });
              //刷新页面
              this.getChapterVideo()
            })
        }) //点击取消，执行catch方法
      },
      //添加小节弹框的方法
      openVideo(chapterId) {
        //弹框
        this.dialogVideoFormVisible = true
        //设置章节id
        this.video.chapterId = chapterId
        this.video.title=''
        this.video.free=1
        this.video.sort=0
      },

      openEditVideo(id) {
        //弹框
        this.dialogVideoFormVisible = true
        //调用接口
        video.getEduVideo(id)
          .then(response => {
            this.video = response.data.eduVideo
          })
      },
      //添加小节
      addVideo() {
        //设置课程id
        this.video.courseId = this.courseId
        video.addVideo(this.video)
          .then(response => {
            //关闭弹框
            this.dialogVideoFormVisible = false
            //提示
            this.$message({
              type: 'success',
              message: '添加小节成功!'
            });
            //刷新页面
            this.getChapterVideo()
          })
      },

      //更新小节
      updateVideo() {
        //设置课程id
        video.updateEduVideo(this.video)
          .then(response => {
            //关闭弹框
            this.dialogVideoFormVisible = false
            //提示
            this.$message({
              type: 'success',
              message: '编辑小节成功!'
            });
            //刷新页面
            this.getChapterVideo()
          })
      },



      saveOrUpdateVideo() {
        if(!this.video.id) {
          this.addVideo()
        } else {
          this.updateVideo()
        }
      },

//==============================章节操作====================================
      //删除章节
      removeChapter(chapterId) {
        this.$confirm('此操作将删除章节, 是否继续?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(() => {  //点击确定，执行then方法
          //调用删除的方法
          chapter.deleteChapter(chapterId)
            .then(response =>{//删除成功
              //提示信息
              this.$message({
                type: 'success',
                message: '删除成功!'
              });
              //刷新页面
              this.getChapterVideo()
            })
        }) //点击取消，执行catch方法
      },
      //修改章节弹框数据回显
      openEditChatper(chapterId) {
        //弹框
        this.dialogChapterFormVisible = true
        //调用接口
        chapter.getChapter(chapterId)
          .then(response => {
            this.chapter = response.data.chapter
          })
      },
      //弹出添加章节页面
      openChapterDialog() {
        //弹框
        this.dialogChapterFormVisible = true
        //表单数据清空
        this.chapter.title = ''
        this.chapter.sort = 0
      },
      //添加章节
      addChapter() {
        //设置课程id到chapter对象里面
        this.chapter.courseId = this.courseId
        chapter.addChapter(this.chapter)
          .then(response => {
            //关闭弹框
            this.dialogChapterFormVisible = false
            //提示
            this.$message({
              type: 'success',
              message: '添加章节成功!'
            });
            //刷新页面
            this.getChapterVideo()
          })
      },
      //修改章节的方法
      updateChapter() {
        chapter.updateChapter(this.chapter)
          .then(response =>  {
            //关闭弹框
            this.dialogChapterFormVisible = false
            //提示
            this.$message({
              type: 'success',
              message: '修改章节成功!'
            });
            //刷新页面
            this.getChapterVideo()
          })
      },
      saveOrUpdate() {
        if(!this.chapter.id) {
          this.addChapter()
        } else {
          this.updateChapter()
        }
      },
      //根据课程id查询章节和小节
      getChapterVideo() {
        chapter.getAllChapterVideo(this.courseId)
          .then(response => {
            this.chapterVideoList = response.data.allChapterVideo
          })
      },
      previous() {
        this.$router.push({path:'/course/info/'+this.courseId})
      },
      next() {
        //跳转到第二步
        this.$router.push({path:'/course/publish/'+this.courseId})
      }
    }
  }
</script>
<style scoped>
  .chanpterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
  }
  .chanpterList li{
    position: relative;
  }
  .chanpterList p{
    float: left;
    font-size: 20px;
    margin: 10px 0;
    padding: 10px;
    height: 70px;
    line-height: 50px;
    width: 100%;
    border: 1px solid #DDD;
  }
  .chanpterList .acts {
    float: right;
    font-size: 14px;
  }

  .videoList{
    padding-left: 50px;
  }
  .videoList p{
    float: left;
    font-size: 14px;
    margin: 10px 0;
    padding: 10px;
    height: 50px;
    line-height: 30px;
    width: 100%;
    border: 1px dotted #DDD;
  }

</style>
